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I downloaded vlc-3.0.0-20171121-0442-git-win64.exe, turned on the Scene Video Filter, and set the Scene Filter preferences (path prefix = ...\Desktop\Snapshots, Recording ratio = 30). I tried Filename prefix = '$T' and 'vlcsnap-%H-%M-%S', but no files appeared in the specified folder after I hit play.

VLC 2.2.6 Umbrella on Windows 10
How can I add a timestamp to the filename prefix when using Scene Video Filter to take automatic snapshots?
I tried entering $T and %H-%M-%S in [Filename prefix], (Advanced preferences -->Filters-->Scene filter), but it didn't work.